package com.szt.sy.util.web;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

import org.apache.commons.io.FileUtils;
import org.springframework.web.multipart.MultipartFile;

/***
 * 文件上传
 * 
 * @author wwy
 *
 */
public class FileUpload {
	
	private static final DateFormat SDF = new SimpleDateFormat("/yyyy/MM/dd/");
	
	private static final Random RANDOM = new Random();
	
	public static String getDate() {
		return SDF.format(new Date());
	}
	
	/**
	 * 上传文件
	 *
	 * @param file
	 *            //文件对象
	 * @param filePath
	 *            //上传路径
	 * @param fileName
	 *            //文件名
	 * @return 文件名
	 */
	public static String fileUp(MultipartFile file, String filePath, String fileName) {
		// 扩展名格式
		String extName = "";
		String date = getDate();
		String randomInt = RANDOM.nextInt(10) + "/";
		try {
			if (file.getOriginalFilename().lastIndexOf(".") >= 0) {
				extName = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
			}
			copyFile(file.getInputStream(), filePath + date + randomInt, fileName + extName).replaceAll("-", "");
		} catch (IOException e) {
			System.out.println(e);
		}
		return date + randomInt + fileName + extName;
	}
	
	/**
	 * 写文件到当前目录的upload目录中
	 *
	 * @param in
	 * @param fileName
	 * @throws IOException
	 */
	private static String copyFile(InputStream in, String dir, String realName) throws IOException {
		File file = mkdirsmy(dir, realName);
		FileUtils.copyInputStreamToFile(in, file);
		return realName;
	}
	
	/**
	 * 判断路径是否存在，否：创建此路径
	 *
	 * @param dir
	 *            文件路径
	 * @param realName
	 *            文件名
	 * @throws IOException
	 */
	public static File mkdirsmy(String dir, String realName) throws IOException {
		File file = new File(dir, realName);
		if (!file.exists()) {
			if (!file.getParentFile().exists()) {
				file.getParentFile().mkdirs();
			}
			file.createNewFile();
		}
		return file;
	}
	
}
